Brain aneurysms develop when the wall of a brain artery weakens, causing it to enlarge. A type of brain aneurysm known as a berry aneurysm accounts for ninety percent of all brain aneurysms. As the name suggests, berry aneurysms look like a berry hanging from a narrow stem, and they are typically found at the Circle of Willis, an area at the base of the skull where several major blood vessels converge. Brain aneurysms occur in an estimated 1.5 to five percent of individuals, and they are considered serious because of the risk of rupture. If a rupture occurs, blood from the aneurysm will move into the brain, and this is considered a life-threatening situation that requires emergency care. Roughly 0.5 to three percent of individuals who have brain aneurysms will go on to experience a rupture. Patients with brain aneurysms may experience drooping eyelids, speech difficulties, large pupils, pain behind the eyes, blurry vision, and a severe headache localized to a particular part of the head. To check for an aneurysm, doctors will perform imaging studies. Treatment options for both ruptured and unruptured brain aneurysms include surgical clipping, endovascular coiling, and flow diverters.
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